Refurbished iMac with OSx and the screen jumps/flickers about every 10 - 15 seconds.   Suggestions?  It often seems fine on start up .

I recently got a refurbed iMac with OSx adn the screen jumps/flicks every 10-15 seconcds.  suggestions?

If you purchased it from Apple, you are covered by the warranty - take advantage of it and call them as that appears to be a graphics issue.

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